Effect of Fiber Orientation on Ionic Conductivity of Electrospun Polyimide Nanofibers Mats

전기방사 폴리이미드 나노섬유매트의 섬유배향이 이온전도도에 미치는 영향

  • Huh, Yang-Il (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Kim, Young-Hee (WCU Research Team, Department of Polymer-Nano Science and Technology, Chonbuk National University) ;
  • Ahn, Jou-Hyeon (Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University) ;
  • Lee, Hong-Ki (Fuel Cell Regional Innovation Center, Woosuk University) ;
  • Nah, Chang-Woon (WCU Research Team, Department of Polymer-Nano Science and Technology, Chonbuk National University)
  • 허양일 (전남대학교 응용화학공학부) ;
  • 김영희 (전북대학교 공과대학 고분자.나노공학과 WCU 연구팀) ;
  • 안주현 (경상대학교 생명화학공학과) ;
  • 이홍기 (우석대학교 수소연료전지지역혁신센터) ;
  • 나창운 (전북대학교 공과대학 고분자.나노공학과 WCU 연구팀)
  • Received : 2010.01.18
  • Accepted : 2010.01.26
  • Published : 2010.03.30

Abstract

In this study, polyimide(PI) nanofibers mats were prepared by electrospinning and three different fiber morphologies of random, uniaxial, and biaxial orientation were prepared by controlling the speed of drum-shaped collector and other parameters. The SEM studies reveal that the aforesaid morphologies were obtained on the nano-fibrous mats prepared. The ionic conductivity was measured using an in-plane type conductivity tester for the PI mats soaked in the mixture of 1M lithium trifluoro-methane-sulfonate and tetra-ethylene glycol dimethyl ether. The ionic conductivity was surprisingly higher for the biaxial PI mats. For the uniaxially-oriented mats, the ionic conductivity was found to be higher in the parallel direction compared to the perpendicular direction of the fiber orientation. A curious cyclic fluctuation was found in the ionic conductivity with time. The observed behavior was explained by considering the distance between fibers and transport speed of ions used in this study.

Acknowledgement

Supported by : Chonnam National University

References

  1. J. Doshi and D.H. Reneker, J. Electrost., 35, 151 (1995). https://doi.org/10.1016/0304-3886(95)00041-8
  2. R.R. Luise, Ed., Applications of High Temperatures, CRC Press, New York (1997).
  3. G. Mathew, J.P. Hong, J.M. Rhee, D.J. Leo, and C. Nah, J. Appl. Polym. Sci., 101, 2017 (2006). https://doi.org/10.1002/app.23762
  4. C. Nah, S.H. Han, M.-H. Lee, J.S. Kim, and D.S. Lee, Polym. Int., 52, 429 (2003). https://doi.org/10.1002/pi.1106
  5. C.H. Hamann, A. Hamnett, and W. Vielstch, Electrochemistry, 2nd Ed., Wiley-VCH (2007).